Report Created: August 2024
A PurpleAir and a PurpleAir Flex air quality monitoring sensor was installed at a monitoring site in East Hartford, Connecticut to evaluate the sensors performance tracking PM2.5 data. PurpleAir data was corrected using the extended U.S-wide correction equation developed by the EPA to reduce bias in sensor data (more information found here: AirNow). Hourly data from 2023 was then compared to a T640 reference monitor located at the same location. The full dataset used can be downloaded here Download CSV.
Sensor Details
PurpleAir Specifications
| Sensor Type | Possible Configuration | Evaluated Configuration | Cost | Data Access | Power Supply | Considerations | Reference Monitor Compared |
| PurpleAir | |||||||
| PurpleAir Flex |
Setup
photos here
Timeseries Comparison
PurpleAir and PurpleAir Flex hourly data for PM 2.5, temperature and relative humidity were compared by quarter to reference values (Q1: January-March, Q2: April-June, Q3: July-September, Q4: October-December).
PM2.5
Quarter 1
Quarter 2
Quarter 3
Quarter 4
Temperature
Quarter 1
Quarter 2
Quarter 3
Quarter 4
Relative Humidity
Quarter 1
Quarter 2
Quarter 3
Quarter 4
Correlation Comparison
Purple Air and Reference Correlation
PM2.5
Temperature
Relative Humidity
Purple Air Flex and Reference Correlation
PM2.5
Temperature
Relative Humidity
Purple Air and Purple Air Flex
PM2.5
Temperature
Relative Humidity
Results Summary
